Georgiev, M, Afonso, A, Neubauer, H, Needham, H, Thiéry, R, Rodolakis, A, Roest, H J, Staerk, K D C, Stegeman, J A, Vellema, P, van der Hoek, W, More, S J, "Q fever in humans and farm animals in four European countries, 1982 to 2010", EUROSURVEILLANCE,